The laminated beam shown in Figure 7.9 is made up of two outer plies of material " \(\mathrm{A}\) " having Young's modulus \(E_{\mathrm{A}}\), two inner plies of material " \(\mathrm{B}\) " having Young's modulus \(E_{B}\), and a honeycomb core of negligible stiffness. Materials A and B are isotropic, but they have different thicknesses. The laminate is symmetric about the middle surface. Find the expression for the flexural modulus in terms of the given properties and the dimensions shown in Figure 7.9.

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FIGURE 7.9 ZA ZB ZC ZA ZB Zc Material "A" Material "B" Core Middle surface Material "B" - Material "A"